文件及目录拷贝

package eflylin;
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import java.io.*;
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import java.util.Date;
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import java.text.SimpleDateFormat;
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public class BufferedInputFile {
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    public static String read(String filename) throws IOException{
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        BufferedReader in = new BufferedReader(new FileReader(filename));
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        String s;
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        StringBuilder sb = new StringBuilder();
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        while((s = in.readLine())!= null){
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            sb.append(s);
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        }
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        in.close();
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        return sb.toString();
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    }
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    public static void copyfile(String inputname,String outputname) throws IOException{
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        InputStream in = new FileInputStream(inputname);
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        OutputStream out = new FileOutputStream(outputname);
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        byte[] buffer = new byte[1024];
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        int read = 0;
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        while((read = in.read(buffer))!= -1){
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            out.write(buffer,0,read);
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            System.out.print(read);
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            System.out.print(buffer);
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            System.out.print("/n");
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        }
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        in.close();
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        out.close();
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    }
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    public static void copyDir(String inputname,String outputname) throws IOException{
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        (new File(outputname)).mkdirs();
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        File[] file=(new File(inputname)).listFiles();
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        for(int i=0;i<file.length;i++){
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            if(file[i].isFile()){
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                file[i].toString();
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                FileInputStream input=new FileInputStream(file[i]);
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                //mkdir if destination does not exist
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                File outtest = new File(outputname);
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                if (!outtest.exists()){
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                    outtest.mkdir();
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                }
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                FileOutputStream output=new FileOutputStream(outputname+"/"+(file[i].getName()).toString());
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                byte[] b=new byte[1024*5];
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                int len;
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                while((len=input.read(b))!=-1){
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                    output.write(b,0,len);
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                }
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                output.flush();
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                output.close();
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                input.close();
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            }else if (file[i].isDirectory()){
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                //System.out.print(file[i].getAbsolutePath()+ "/n" + file[i].getName());
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                System.out.print(file[i].toString()+ "," + outputname + "//" + file[i].getName());
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                copyDir(file[i].toString(),outputname+ "//" + file[i].getName());
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            }
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        }
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    }
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    public static void main(String[] args)throws IOException{
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        //System.out.print(read("BOOTEX.LOG"));
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        //copyDir("mysrc","des2");
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        Date date = new Date();
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        SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
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        System.out.println(df.format(new Date()));
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        //System.out.print(date.getMonth()+"/n");
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        //System.out.print(date.getDate()+ "/n");
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        //System.out.print(date.toGMTString()+"/n");
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    }
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}